(57) A cigarette making machine includes apparatus for determining the internal pressure
of an axially moving cigarette rod comprising means (11) for forming a continuous
rod (12) in which a wrapper web (8) surrounds a tobacco filler (3), including an endless
impervious flexible tape (10) arranged to be wrapped around at least part of the circumference
of the rod, a guide (19, 20) through which the rod and tape are arranged to pass,
means (21, 30, 31) for supplying air under pressure to the guide to enter a gap between
the guide and the tape; and monitoring means (22) for monitoring a physical characteristic
of the supplied air. The specification also described means for compensating for the
effect which moisture in the tobacco has on the internal pressure of the cigarette
rod.
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